Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcb874605691081…

MALICIOUS

PDF

87.4 KB Created: 2021-07-14 02:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 163fb8edd2e495e9ba4fb7c004ad8e89 SHA-1: 9ddd1f132d97c1fdb99e9cff3472e8486fb93615 SHA-256: bfcb87460569108186491233af8726d09ec63769d674aeac96a11a485c5a17c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://farmaciacogliate.it/userfiles/files/57969038903.pdf In PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5d0e724a1b5e1045b6d2616e0cc058cc/6277139708.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde48915ed---59488236384.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/068dd3e5c82fa8591b2af39c9f4d8532/dujoxiwiruzoruvujamujug.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/68230149013.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4e4d7f16f6f77d9d2265310a704eae5e/kigivodogujixivuzo.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3bf868db1007c8df8d850987df93c91c/remugaloleluzoluvivi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b30beea8909---91279628335.pdfIn PDF document text
    • http://africareview.in/userfiles/file/lopoxexobalupofam.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d166db2fa---59156202385.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/ngk57b7dids6j6seqpqqf6717v/15615816707.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/gilogiraterowawebizitiseg.pdfIn PDF document text
    • http://italvaping.com/file/95028963720.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcacd118fb---50480374602.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/4talh3lvjks8kh7983nr90p902/bedolexopedej.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7b99d9db3729d3fbd3d346de1f155568/lopuwapaleg.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/baporuguwi.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/7999606452.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/aa4b6acd114b6e8c815262e4e403b62e/72735891316.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/0b1286c7a33ffe662b758d51293f39fa/savigebufuvunog.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lijofd6rgretcisrgl3n7igdt1/5267330148.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/0mb8vun4gm61q3gguilgfq2ges/58185826015.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/20754039456.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/78437920734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=i+need+somebody+to+know+somebody+to+have+somebody+to+holdPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 10772 bytes
SHA-256: 9d71df1ccba4d4d17cc6471e14ac88c08c622ef68385561d8c9e628b98c78901
font_01_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 17572 bytes
SHA-256: ce21525dd5eb8680bacaf21ea6531a7796e20e4f4d200b9c1ee00e54df210638